board: sophgo: add support for Milk-V Duo 256M
Add U-Boot support for Milk-V Duo 256M. This board has a different SoC compared to the Milk-V Duo 64M, it uses the Sophgo SG2002 instead of the Sophgo CV1800B. Both SoCs share many common IP blocks, so this board reuses the existing cv1800b CPU support. The board shares the same 'board.c' with Milk-V Duo 64MB (CV1800B), so use the same file for now. Link: https://milkv.io/docs/duo/getting-started/duo256m Signed-off-by: Hiago De Franco <hfranco@baylibre.com> Acked-by: Leo Yu-Chi Liang <leo.liang@sifive.com>
This commit is contained in:
Hiago De Franco
committed by
Leo Yu-Chi Liang
Leo Yu-Chi Liang
parent
bacb61a06f
commit
98b59e181d
@@ -29,6 +29,9 @@ config TARGET_MICROCHIP_GENERIC
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config TARGET_MILKV_DUO
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bool "Support Milk-v Duo Board"
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config TARGET_MILKV_DUO_256M
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bool "Support Milk-V Duo 256M Board"
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config TARGET_OPENPITON_RISCV64
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bool "Support RISC-V cores on OpenPiton SoC"
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@@ -118,6 +121,7 @@ source "board/sifive/unleashed/Kconfig"
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source "board/sifive/unmatched/Kconfig"
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source "board/sipeed/maix/Kconfig"
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source "board/sophgo/milkv_duo/Kconfig"
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source "board/sophgo/milkv_duo_256m/Kconfig"
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source "board/sophgo/licheerv_nano/Kconfig"
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source "board/spacemit/k1/Kconfig"
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source "board/starfive/visionfive2/Kconfig"
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@@ -5,6 +5,7 @@ dtb-$(CONFIG_TARGET_ANDES_VOYAGER) += qilai-voyager.dtb
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dtb-$(CONFIG_TARGET_K230_CANMV) += k230-canmv.dtb
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dtb-$(CONFIG_TARGET_MICROCHIP_ICICLE) += mpfs-icicle-kit.dtb
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dtb-$(CONFIG_TARGET_MILKV_DUO) += cv1800b-milkv-duo.dtb
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dtb-$(CONFIG_TARGET_MILKV_DUO_256M) += sg2002-milkv-duo256m.dtb
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dtb-$(CONFIG_TARGET_LICHEERV_NANO) += sg2002-licheerv-nano-b.dtb
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dtb-$(CONFIG_TARGET_QEMU_VIRT) += qemu-virt32.dtb qemu-virt64.dtb
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dtb-$(CONFIG_TARGET_OPENPITON_RISCV64) += openpiton-riscv64.dtb
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@@ -0,0 +1,46 @@
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// SPDX-License-Identifier: (GPL-2.0 OR MIT)
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/*
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* Copyright (C) 2026 Hiago De Franco <hfranco@baylibre.com>
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*/
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/dts-v1/;
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#include "sg2002.dtsi"
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/ {
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model = "Milk-V Duo 256M";
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compatible = "milkv,duo256m", "sophgo,sg2002";
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aliases {
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serial0 = &uart0;
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serial1 = &uart1;
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serial2 = &uart2;
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serial3 = &uart3;
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serial4 = &uart4;
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};
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chosen {
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stdout-path = "serial0:115200n8";
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};
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};
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ðernet0 {
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status = "okay";
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phy-mode = "rmii";
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};
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&osc {
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clock-frequency = <25000000>;
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};
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&sdhci0 {
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status = "okay";
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bus-width = <4>;
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no-1-8-v;
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no-mmc;
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no-sdio;
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};
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&uart0 {
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status = "okay";
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};
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@@ -0,0 +1,30 @@
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if TARGET_MILKV_DUO_256M
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config SYS_BOARD
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default "milkv_duo_256m"
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config SYS_VENDOR
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default "sophgo"
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config SYS_CPU
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default "cv1800b"
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config SYS_CONFIG_NAME
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default "milkv_duo_256m"
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# The vendor FIP tool prepends a 32-byte loader header to u-boot.bin and loads
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# the result at 0x80200000, so the U-Boot code runs 0x20 bytes above that.
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config TEXT_BASE
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default 0x80200020
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config ENV_SIZE
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default 0x20000
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config ENV_SECT_SIZE
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default 0x40000
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config BOARD_SPECIFIC_OPTIONS
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def_bool y
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select SOPHGO_CV1800B
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endif
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@@ -0,0 +1,5 @@
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Milk-V Duo 256M
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M: Hiago De Franco <hfranco@baylibre.com>
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S: Maintained
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F: board/sophgo/milkv_duo_256m/
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F: configs/milkv_duo_256m_defconfig
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@@ -0,0 +1,6 @@
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# SPDX-License-Identifier: GPL-2.0+
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#
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# Copyright (c) 2026, Hiago De Franco <hfranco@baylibre.com>
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obj-y += ../milkv_duo/board.o
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obj-$(CONFIG_NET_LEGACY) += ../common/ethernet.o
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@@ -0,0 +1,8 @@
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fdt_addr_r=0x84000000
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fdtfile=CONFIG_DEFAULT_DEVICE_TREE.dtb
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kernel_addr_r=0x80200000
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kernel_comp_addr_r=0x88000000
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kernel_comp_size=0x4000000
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pxefile_addr_r=0x84300000
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ramdisk_addr_r=0x84400000
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scriptaddr=0x84200000
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@@ -0,0 +1,42 @@
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CONFIG_RISCV=y
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CONFIG_SYS_MALLOC_LEN=0x820000
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CONFIG_SYS_MALLOC_F_LEN=0x8000
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CONFIG_NR_DRAM_BANKS=1
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CONFIG_HAS_CUSTOM_SYS_INIT_SP_ADDR=y
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CONFIG_CUSTOM_SYS_INIT_SP_ADDR=0x82300000
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CONFIG_DEFAULT_DEVICE_TREE="sg2002-milkv-duo256m"
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CONFIG_SYS_LOAD_ADDR=0x80080000
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CONFIG_IDENT_STRING="milkv_duo_256m"
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CONFIG_TARGET_MILKV_DUO_256M=y
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CONFIG_ARCH_RV64I=y
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CONFIG_RISCV_SMODE=y
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CONFIG_FIT=y
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CONFIG_BOOTSTD_FULL=y
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# CONFIG_BOOTMETH_EFI_BOOTMGR is not set
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CONFIG_SD_BOOT=y
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CONFIG_SYS_CBSIZE=512
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CONFIG_SYS_PBSIZE=544
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CONFIG_SYS_PROMPT="milkv_duo_256m# "
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# CONFIG_CMD_BOOTDEV is not set
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CONFIG_CMD_MBR=y
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CONFIG_CMD_MMC=y
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CONFIG_CMD_POWEROFF=y
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# CONFIG_CMD_MII is not set
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CONFIG_CMD_EXT4_WRITE=y
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# CONFIG_ISO_PARTITION is not set
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# CONFIG_EFI_PARTITION is not set
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CONFIG_ENV_OVERWRITE=y
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CONFIG_NET_RANDOM_ETHADDR=y
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CONFIG_CLK_SOPHGO_CV1800B=y
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CONFIG_MMC=y
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CONFIG_MMC_IO_VOLTAGE=y
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CONFIG_MMC_UHS_SUPPORT=y
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CONFIG_MMC_SDHCI=y
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CONFIG_MMC_SDHCI_ADMA=y
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CONFIG_MMC_SDHCI_CV1800B=y
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CONFIG_ETH_DESIGNWARE=y
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CONFIG_SYS_NS16550=y
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CONFIG_SYS_NS16550_MEM32=y
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CONFIG_SPI=y
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CONFIG_SYSRESET=y
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CONFIG_SYSRESET_CV1800B=y
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@@ -6,4 +6,5 @@ Sophgo
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:maxdepth: 1
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milkv_duo
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milkv_duo_256m
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licheerv_nano
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@@ -0,0 +1,84 @@
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.. SPDX-License-Identifier: GPL-2.0+
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Milk-V Duo 256M
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===============
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SG2002 RISC-V SoC
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------------------
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The SG2002 is a high-performance, low-power 64-bit RISC-V/ARM SoC from Sophgo.
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Mainline support
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----------------
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The support for following drivers are already enabled:
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1. ns16550 UART Driver.
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2. Synopsys Designware MSHC Driver.
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3. Synopsys Designware Ethernet Controller.
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Building
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~~~~~~~~
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1. Add the RISC-V toolchain to your PATH.
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2. Setup ARCH & cross compilation environment variable:
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.. code-block:: console
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export CROSS_COMPILE=<riscv64 toolchain prefix>
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cd <U-Boot-dir>
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make milkv_duo_256m_defconfig
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make
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This will generate u-boot.bin
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Booting
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~~~~~~~
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Currently, we rely on vendor FSBL (First Stage Boot Loader) to initialize the
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clock and load OpenSBI and the u-boot image, then bootup from it.
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To run u-boot.bin on top of FSBL, follow these steps:
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1. Generate a compatible u-boot.bin using U-Boot with the Milk-V Duo 256M
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default configuration.
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2. Use mainline OpenSBI with a newer version than 1.5 to generate fw_dynamic.
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Use FDT_FW_PATH to point to sg2002-milkv-duo256m.dtb device tree file while
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compiling fw_dynamic. Example:
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.. code-block:: console
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cd open-sbi
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PLATFORM=generic FW_FDT_PATH=../u-boot/arch/riscv/dts/sg2002-milkv-duo256m.dtb make
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This will generate build/platform/generic/firmware/fw_dynamic.bin.
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3. Use the vendor-provided tool [1] to create a unified fip.bin file containing
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FSBL, OpenSBI, and U-Boot.
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Note that you will have to use the file cv181x.bin as the FSBL.
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4. Place the generated fip.bin file into the FAT partition of the SD card.
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5. Insert the SD card into the board and power it on.
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The board will automatically execute the FSBL from the fip.bin file.
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Subsequently, it will transition to OpenSBI, and finally, OpenSBI will invoke
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U-Boot.
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[1]: https://github.com/sophgo/fiptool
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Sample boot log from Milk-V 256M Duo board
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. code-block:: none
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U-Boot 2026.07-00002-g0b690770386f-dirty (Jul 07 2026 - 13:33:36 -0300)milkv_duo_256m
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DRAM: 256 MiB
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Core: 20 devices, 13 uclasses, devicetree: separate
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MMC: mmc@4310000: 0
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Loading Environment from nowhere... OK
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In: serial@4140000
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Out: serial@4140000
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Err: serial@4140000
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Net:
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Warning: ethernet@4070000 (eth0) using random MAC address - 0a:f3:23:40:7e:55
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eth0: ethernet@4070000
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Hit any key to stop autoboot: 0
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milkv_duo_256m#
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@@ -0,0 +1,12 @@
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/* SPDX-License-Identifier: GPL-2.0+ */
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/*
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* Copyright (c) 2026, Hiago De Franco <hfranco@baylibre.com>
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*
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*/
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#ifndef __CONFIG_H
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#define __CONFIG_H
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#define CFG_SYS_SDRAM_BASE 0x80000000
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#endif /* __CONFIG_H */
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